NGDC's U.S. Coastal Relief Model (CRM) provides the first comprehensive view of the
U.S. coastal zone integrating offshore bathymetry with land topography into a seamless
representation of the coast. The CRM spans the U.S. East and West Coasts, the northern
coast of the Gulf of Mexico, Puerto Rico, and Hawaii, reaching out to, and in places
even beyond, the continental slope. Bathymetric and topographic data sources include:
NGDC's NOS hydrographic surveys, multibeam bathymetry, and trackline bathymetry; the
U.S. Geological Survey (USGS); and other federal government agencies and academic
institutions. Bathymetric contours from the International Bathymetric Chart of the
Caribbean Sea and the Gulf of Mexico project were also used. Digital elevation models
(DEMs) of the Great Lakes, Southern Alaska, and high-resolution DEMs of U.S. coastal
communities and territories are also available.